如何使用Swift绘制720个数据点
我目前正在写一个游戏杆的应用程序，我想显示我的激光雷达传感器的轮廓; 我正在使用精灵套件，但它是滞后的; 我假设它占用了太多的内存
我的激光雷达传感器返回给我360个数据点，其中每个度数表示它碰到物体（墙）的距离，
我正在初始化didMoveToView中的所有精灵套件节点，有没有更好的方法来实现这一点？ 也许在初始化？
我正在创build720个精灵套件节点，因为360代表线条，360代表数据点（距离）
看起来好像我创build了太多的精灵套件节点（720+）
另外，我打算通过我的应用程序提供videostream。 Sprite Kit是最好的select吗？
import Foundation import UIKit import SpriteKit class GameScene: SKScene { var visual = SKSpriteNode() let button = SKShapeNode(rect: CGRect(x: 0, y: 0, width: 100, height: 50), cornerRadius: 10) var distances: [Int] = [2601, 2600, 33, 2608, 2601, 2594, 2625, 2633, 2637, 2651, 2656, 2666, 2683, 2690, 2705, 2712, 2712, 2739, 2752, 53, 1103, 1060, 1019, 980, 944, 911, 33, 851, 826, 801, 777, 757, 737, 718, 701, 683, 667, 654, 53, 486, 470, 457, 448, 440, 432, 424, 416, 409, 403, 396, 389, 383, 378, 372, 367, 362, 357, 353, 348, 344, 340, 336, 333, 329, 326, 323, 319, 317, 314, 311, 309, 307, 305, 303, 301, 299, 298, 297, 295, 294, 293, 292, 291, 290, 290, 290, 290, 291, 293, 295, 303, 386, 383, 53, 350, 53, 53, 53, 53, 53, 3, 364, 362, 360, 356, 358, 355, 353, 351, 350, 349, 347, 345, 53, 53, 53, 308, 3, 309, 309, 312, 313, 315, 316, 319, 321, 53, 329, 332, 335, 332, 53, 53, 53, 53, 53, 53, 53, 3, 53, 53, 53, 53, 53, 53, 670, 33, 706, 728, 750, 772, 799, 825, 856, 887, 925, 755, 749, 744, 739, 734, 730, 727, 722, 719, 716, 714, 634, 709, 706, 704, 703, 701, 699, 700, 695, 697, 697, 338, 696, 697, 696, 698, 698, 700, 702, 703, 705, 707, 710, 712, 714, 718, 53, 53, 53, 53, 53, 53, 53, 53, 3, 53, 53, 53, 53, 53, 53, 53, 53, 3, 53, 53, 53, 53, 53, 53, 53, 3412, 3397, 3384, 53, 3538, 3603, 53, 2426, 2412, 2363, 2330, 2288, 2262, 2214, 2190, 2162, 2130, 53, 53, 53, 2807, 2631, 2408, 2638, 2607, 2601, 2562, 2534, 2515, 2496, 2478, 2462, 2445, 53, 53, 53, 1751, 53, 53, 53, 53, 53, 53, 53, 53, 53, 53, 53, 3, 53, 53, 53, 53, 53, 2643, 2643, 53, 2660, 53, 2528, 2523, 2221, 1955, 1684, 1677, 1684, 1694, 1705, 1202, 1204, 1211, 1217, 1225, 1233, 1239, 1249, 1259, 1270, 1280, 1289, 1280, 1011, 991, 977, 968, 966, 964, 968, 975, 984, 1003, 2, 53, 1297, 53, 53, 33, 1321, 1299, 1274, 1254, 1233, 1232, 1264, 1293, 3802, 53, 53, 53, 53, 53, 53, 53, 3, 53, 2878, 2870, 2848, 2821, 2803, 2788, 2769, 2753, 2740, 2708, 2711, 2701, 2682, 2656, 2664, 2644, 2644, 2631, 2626, 2616, 2610, 2604, 2605, 2605, 2600, 2598, 2603] var scalex: [Double] = [] var scaley: [Double] = [] var disx: [Double] = [] var disy: [Double] = [] var somenodes = [SKSpriteNode()] var newnodes = [SKShapeNode()] override init(size: CGSize) { print("this is in init!") super.init(size: size) } required init?(coder aDecoder: NSCoder) { fatalError("init(coder:) has not been implemented") } let rotateAnalogStick = AnalogJoystick(diameter: 100) override func didMoveToView(view: SKView) { /* Setup your scene here */ visual.color = UIColor.clearColor() visual.size = CGSize(width: 350, height: 350) visual.position = CGPointMake(frame.midX, frame.midY + 150) addChild(visual) for index in 0...356 { var radians = Double(index) * M_PI / 180.0 var x = Double(distances[index]) * cos(Double(radians)) var y = Double(distances[index]) * sin(Double(radians)) disx.append(x) disy.append(y) } var path = CGPathCreateMutable() var xmin: Double = Double(disx.minElement()!) var xmax: Double = Double(disx.maxElement()!) var ymin: Double = Double(disy.minElement()!) var ymax: Double = Double(disy.maxElement()!) var scale = max(xmax - xmin, ymax - ymin) for index in 0...356 { var radians = Double(index) * M_PI / 180.0 var x = (Double(distances[index]) * cos(Double(radians)) / scale) * 350 var y = (Double(distances[index]) * sin(Double(radians)) / scale) * 350 print("(\(x),\(y))") var mynode = SKSpriteNode() mynode.color = UIColor.redColor() mynode.size = CGSize(width: 2, height: 2) let circlenode = SKShapeNode() let circlePath = UIBezierPath(arcCenter: CGPoint(x: 0,y: 0), radius: CGFloat(5), startAngle: CGFloat(0), endAngle:CGFloat(M_PI * 2), clockwise: true) circlenode.path = circlePath.CGPath //change the fill color circlenode.fillColor = UIColor.blueColor() //you can change the stroke color circlenode.strokeColor = UIColor.redColor() //you can change the line width circlenode.lineWidth = 0.5 circlenode.zPosition = 1 circlenode.position = CGPointMake(CGFloat(x), CGFloat(y)) newnodes.append(circlenode) CGPathMoveToPoint(path, nil, 0, 0) // from CGPathAddLineToPoint(path, nil, CGFloat(x), CGFloat(y)) // to let shape = SKShapeNode() shape.path = path shape.strokeColor = UIColor.purpleColor() shape.lineWidth = 1 visual.addChild(shape) visual.addChild(newnodes[index]) } let newscale = SKAction.scaleTo(0.1, duration: 0.5) let fadein = SKAction.fadeInWithDuration(0.5) let fadeout = SKAction.fadeOutWithDuration(0.5) let outsequence = SKAction.sequence([fadeout]) let insequence = SKAction.sequence([fadein]) for index in 0...visual.children.count { // visual.children[index].runAction(insequence) // visual.children[index].runAction(repeatout) } button.fillColor = UIColor.blueColor() button.position = CGPointMake(frame.midX - 50, frame.midY - 110) addChild(button) var mylabel = SKLabelNode() mylabel.color = UIColor.blackColor() mylabel.fontSize = 12 mylabel.fontName = "AvenirNext-Bold" mylabel.text = "Contour Display" mylabel.position = CGPointMake(50, 20) mylabel.zPosition = 1 button.addChild(mylabel) backgroundColor = UIColor.whiteColor() physicsBody = SKPhysicsBody(edgeLoopFromRect: frame) rotateAnalogStick.position = CGPointMake(frame.midX + 5, rotateAnalogStick.radius + 60) rotateAnalogStick.stick.color = UIColor.cyanColor() rotateAnalogStick.substrate.color = UIColor.blackColor() addChild(rotateAnalogStick) rotateAnalogStick.trackingHandler = { data in // cartesian to polar var r = sqrt(pow(Double(data.velocity.x), Double(2)) + pow(Double(data.velocity.y), Double(2))) var power = (r - 0)/(50 - 0) * (1-0) + 0 var theta = atan2(Double(data.velocity.y), Double(data.velocity.x)) // atan(Double(data.velocity.y/data.velocity.x)) // var degrees = theta * (180.0 / M_PI) var packet = "" var offset = 0.0 var rdirection = 0.0 var ldirection = 0.0 var rpower = 0.0 var lpower = 0.0 if (degrees >= 65 && degrees <= 115) { // move forward rpower = power lpower = power rdirection = 1 ldirection = 1 } else if (degrees <= 0 && degrees >= -65) || (degrees >= 0 && degrees <= 65) { // move right offset = 90 - degrees rdirection = min(degrees, offset) ldirection = max(degrees, offset) rpower = (rdirection - 0)/(50 - 0) * (power-0) + 0 lpower = abs(1-rpower) rdirection = -1 ldirection = 1 } else if (degrees <= -115 && degrees >= -180) || (degrees > 115 && degrees < 180 ) { // move left offset = 90 - degrees rdirection = min(degrees, offset) ldirection = max(degrees, offset) rpower = abs(1-rpower) lpower = (rdirection - 0)/(50 - 0) * (power-0) + 0 rdirection = 1 ldirection = -1 } else if (degrees <= -65 && degrees >= -115) { // move down rpower = power lpower = power rdirection = -1 ldirection = -1 } packet = "\(rdirection) \(ldirection) \(rpower) \(lpower)" } view.multipleTouchEnabled = true } override func touchesBegan(touches: Set<UITouch>, withEvent event: UIEvent?) { /* Called when a touch begins */ for touch: AnyObject in touches { // Get the location of the touch in this scene let location = touch.locationInNode(self) // Check if the location of the touch is within the button's bounds if button.containsPoint(location) { print("button tapped!") } } } override func update(currentTime: CFTimeInterval) { /* Called before each frame is rendered */ } } 我想认为，SpriteKit可以轰出720个精灵没有问题。 如上所述，你的主要问题是SKShapeNode使用。
你应该做的是创build你的“点”作为纹理。 如果你想要颜色/轮廓，把它们放在纹理中。 另外，用彩色SKSpriteNode （可以是SKSpriteNode ）创build你的线。 如果你有多个圆的颜色，把它们放在一个纹理图集。
这将使您更好地使用SpriteKit来提高吞吐量。
你正在做didMoveToView这项工作。 多久需要刷新一次？ 如果数据被设置，并且有一个区别是转换它（例如，旋转，缩放，平移），另一种方法是使用Quartz / Core Graphics预渲染整个事物，然后转换渲染。